v4.19.13 snapshot.
diff --git a/arch/arm/mach-stm32/Kconfig b/arch/arm/mach-stm32/Kconfig
new file mode 100644
index 0000000..713c068
--- /dev/null
+++ b/arch/arm/mach-stm32/Kconfig
@@ -0,0 +1,53 @@
+menuconfig ARCH_STM32
+ bool "STMicroelectronics STM32 family" if ARM_SINGLE_ARMV7M || ARCH_MULTI_V7
+ select ARMV7M_SYSTICK if ARM_SINGLE_ARMV7M
+ select HAVE_ARM_ARCH_TIMER if ARCH_MULTI_V7
+ select ARM_GIC if ARCH_MULTI_V7
+ select ARM_PSCI if ARCH_MULTI_V7
+ select ARCH_HAS_RESET_CONTROLLER
+ select CLKSRC_STM32
+ select PINCTRL
+ select RESET_CONTROLLER
+ select STM32_EXTI
+ help
+ Support for STMicroelectronics STM32 processors.
+
+if ARCH_STM32
+
+if ARM_SINGLE_ARMV7M
+
+config MACH_STM32F429
+ bool "STMicroelectronics STM32F429"
+ select ARM_AMBA
+ default y
+
+config MACH_STM32F469
+ bool "STMicroelectronics STM32F469"
+ select ARM_AMBA
+ default y
+
+config MACH_STM32F746
+ bool "STMicroelectronics STM32F746"
+ select ARM_AMBA
+ default y
+
+config MACH_STM32F769
+ bool "STMicroelectronics STM32F769"
+ select ARM_AMBA
+ default y
+
+config MACH_STM32H743
+ bool "STMicroelectronics STM32H743"
+ default y
+
+endif # ARMv7-M
+
+if ARCH_MULTI_V7
+
+config MACH_STM32MP157
+ bool "STMicroelectronics STM32MP157"
+ default y
+
+endif # ARMv7-A
+
+endif
diff --git a/arch/arm/mach-stm32/Makefile b/arch/arm/mach-stm32/Makefile
new file mode 100644
index 0000000..bd0b7b5
--- /dev/null
+++ b/arch/arm/mach-stm32/Makefile
@@ -0,0 +1 @@
+obj-y += board-dt.o
diff --git a/arch/arm/mach-stm32/Makefile.boot b/arch/arm/mach-stm32/Makefile.boot
new file mode 100644
index 0000000..eacfc3f
--- /dev/null
+++ b/arch/arm/mach-stm32/Makefile.boot
@@ -0,0 +1,3 @@
+# Empty file waiting for deletion once Makefile.boot isn't needed any more.
+# Patch waits for application at
+# http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=7889/1 .
diff --git a/arch/arm/mach-stm32/board-dt.c b/arch/arm/mach-stm32/board-dt.c
new file mode 100644
index 0000000..011d57b
--- /dev/null
+++ b/arch/arm/mach-stm32/board-dt.c
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) Maxime Coquelin 2015
+ * Copyright (C) STMicroelectronics 2017
+ * Author: Maxime Coquelin <mcoquelin.stm32@gmail.com>
+ */
+
+#include <linux/kernel.h>
+#include <asm/mach/arch.h>
+#ifdef CONFIG_ARM_SINGLE_ARMV7M
+#include <asm/v7m.h>
+#endif
+
+static const char *const stm32_compat[] __initconst = {
+ "st,stm32f429",
+ "st,stm32f469",
+ "st,stm32f746",
+ "st,stm32f769",
+ "st,stm32h743",
+ "st,stm32mp157",
+ NULL
+};
+
+DT_MACHINE_START(STM32DT, "STM32 (Device Tree Support)")
+ .dt_compat = stm32_compat,
+#ifdef CONFIG_ARM_SINGLE_ARMV7M
+ .restart = armv7m_restart,
+#endif
+MACHINE_END